irrigation motor automatic protector (2)

Published:2011/7/20 4:51:00 Author:chopper | Keyword: irrigation motor, automatic protector | From:SeekIC

　　Rural irrigative pump motor often be burned due to low voltage or phase lack when it runs.This example describes the irrigation motor automatic protector, which can cut off three-phase AC power supply to protect the motor when the phase is lack. 　　The principle of circuitThe irrigation motor automatic protection circuit is formed by the start control circuit, phase-lack control circuit and test circuit,which is shown in Figure 4-97. 　　Start circuit is formed by the start button S2 (S2a, S2b), AC contactor KM and relay K2,etc.



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